Announcement on ClubStylus some of you may be interested in

Differentials
The higher the ratio number the greater is the number of turns of the tail shaft to turn the wheels once. For example, a 4.3:1 ratio, as in the NA6A models, requires 4.3 turns of the tail shaft to turn the wheels once. The 1.8 litre cars in the NA and early NB models had a 4.1:1 ratio; the NB8B had a 3.636:1 ratio. Once again the NB8A anniversary models were different; having a limited slip differential with a 3.909:1 ratio. Limited Slip Differentials available in the 1.6 litre models were viscous LSD's. The viscous LSD contained a silicone fluid. When one wheel began to spin it caused the fluid on that side to spin and in doing so becomes thick and transfers the motion to the other side of the differential. The 1.8 litre cars came with Torsen type differentials (4.1:1 in NA8A models and 3.909:1 in the NB Anniversary 6 speed models). A Torsen LSD uses parallel helix gears to keep the torque balanced to each drive wheel.
The NB8B models have a 3.636:1 ratio open differential.
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